Robin Wilson is an Emeritus Professor of Pure Mathematics at the Open University, Emeritus Professor of Geometry at Gresham College, London, and a former Fellow of Keble College, Oxford University. He is currently a Visiting Professor at the London School of Economics. A former President of the British Society for the History of Mathematics, he has written and edited over 40 books on the history of mathematics, including Lewis Carroll in Numberland, and also on combinatorics and graph theory. Involved with the popularization and communication of mathematics and its history, he has been awarded prizes by the Mathematical Association of America for his 'outstanding expository writing', and the Stanton Medal for outreach activities in combinatorics by the Institute of Combinatorics and its Applications. Amirouche Moktefi is a Lecturer in Philosophy at Tallinn University of Technology, Estonia. He is member of the Ragnar Nurkse Department of Innovation and Governance, Estonia, and is associated with the Archives Henri Poincaré - Philosophy and Researches on Sciences and Technologies in France. His areas of interest include the history of mathematics and logic and the philosophy of visual reasoning. He has extensively published on Dodgson's mathematics and logic.